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[IDV #YZK-803896]: Ticket# BRK-528772

> Yuan,
> 
> For whatever reason, what you have detailed below does not work for me.  I 
> would like both the 2D and 3D fields to be correctly displayed in the 
> stereographic projection in IDV.  I also don’t see two map projections 
> defined in the netCDF file (in the field selector tab I right-clicked on the 
> file and read the metadata and can only find Polar Stereographic).  Can you 
> clarify where you see this?  When I load in any variable (2-D or 3-D) and and 
> click on use grid projection I still see that the coastline does not match up 
> with the background map as in the image I sent previously.  Before loading in 
> the data I did unselect the auto-projection feature.  I do see that the 
> projection is set to stereographic but the two still don’t align.  Would you 
> be able to send me an image of he model terrain on top of the background map 
> to see how it differs from my own?  Also, I am using IDV 4.1 if that makes 
> any difference.
> 
> David
> 

David,
     I see the problem. 
     For historical reason, the nc output from the WRF has never been CF 
compliance. The netCDF group developers have to do something special to make it 
look like good nc file. In your case,
the stereographic projection is being applied to the 3D variable but not 2D and 
this is likely why you see the coast lines not match with your data.

     I will check if there is anything can be done here to make it works.


Yuan
> 
> On Sep 23, 2014, at 12:27 PM, Unidata IDV Support <address@hidden> wrote:
> 
> >> IDV Support,
> >>
> >> I have uploaded the WRF file.  In addition, I have attached a .gif image 
> >> here showing how the coast lines don’t match.
> >>
> >> Thanks for your help,
> >>
> >> David Siuta
> >
> > Hi David,
> >       There is nothing wrong with the IDV or your dataset. Inside this nc 
> > dataset, there are two set projections, polar stereographic and lat/lon. 
> > When you load a 2D variable, it is using lat/lon projection.
> > If you want to see the same projection for 3D variable, you can turn off 
> > the auto set projection under Projections > Auto-set Projection before 
> > creating the display. If you want to switch between these two
> > projections, right click on the legend of one of  display and select: View 
> > > Use Grid Projection. The IDV will do the work of converting the 
> > projection automatically for you.
> >
> >
> > Yuan
> >>
> >> address@hidden
> >>
> >> On Sep 23, 2014, at 10:20 AM, Unidata IDV Support <address@hidden> wrote:
> >>
> >>> David,
> >>>
> >>> Sorry for the delayed response.
> >>>
> >>> Please upload your WRF sample data here:
> >>>
> >>> http://motherlode.ucar.edu/repository/alias/idvupload
> >>>
> >>> and let us know when it has been uploaded.
> >>>
> >>> Best,
> >>>
> >>> Unidata IDV Support
> >>>
> >>>> IDV support,
> >>>>
> >>>> I have done some research in to my problem (Ticket BRK-528772) and found
> >>>> that the standard longitude is not the problem.  It is actually the map
> >>>> projection used by WRF that doesn’t work well with IDV.  Any WRF runs
> >>>> I have done using the polar stereographic  map projection do not match
> >>>> the background map supplied in IDV when I try to view the output in IDV
> >>>> (as well as the latitude and longitude of the WRF grid does not match
> >>>> the background map).  To test this out I changed the WRF projection to
> >>>> Lambert Conformal Conic and reran WRF and no matter what the standard
> >>>> longitude was, the WRF grid was able to perfectly match the IDV
> >>>> background map.  Even though switching WRF to the Lambert projection has
> >>>> solved this problem temporarily, I have a lot of output in the Polar
> >>>> Stereographic projection and would like to be able to use IDV to view
> >>>> some of the output.  Do you have any ideas on how to fix this?
> >>>>
> >>>> Thanks,
> >>>>
> >>>> David Siuta
> >>>> address@hidden
> >>>>
> >>>> Weather Forecast Research Team
> >>>> University of British Columbia
> >>>> Vancouver, BC Canada
> >>>>
> >>>
> >>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: YZK-803896
> >>> Department: Support IDV
> >>> Priority: Normal
> >>> Status: Closed
> >>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: YZK-803896
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> 
> 


Ticket Details
===================
Ticket ID: YZK-803896
Department: Support IDV
Priority: Normal
Status: Open